[Intel-gfx] [PATCH dim 1/2] dim: Add extract-tags command

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Add a command for extracting various tags (eg. Reviwed-by:) from
emails. You can give the comamnd a rangeish to add the tags from
the same email to multiple already applied patches.

The regexp used to pick up tags is purposefully quite broad. People
tend to typo these things, or add extra whitespace etc. However the
broad regexp does mean this occasionally picks up stuff that isn't
a tag. So manually amending the commit is probably a wise idea,
and so I simply decided to also leave a '--- extracted tags ---'
separator in the commit message just before the extracted tags,
which can be cleaned up manually when verifying that the tags look
correct.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 dim | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/dim b/dim
index 6d3b9734b348..4110642b2f4a 100755
--- a/dim
+++ b/dim
@@ -333,6 +333,28 @@ if message_id is not None:
 EOF
 }
 
+message_print_body ()
+{
+	python2 <<EOF
+import email
+
+def print_part(part):
+    mtype = part.get_content_maintype()
+    if mtype == 'text':
+        print(part.get_payload(decode=True))
+
+def print_msg(file):
+    msg = email.message_from_file(file)
+    if msg.is_multipart():
+        for part in msg.get_payload():
+            print_part(part)
+    else:
+        print_part(msg)
+
+print_msg(open('$1', 'r'))
+EOF
+}
+
 # append all arguments as tags at the end of the commit message of HEAD
 function dim_commit_add_tag
 {
@@ -973,6 +995,44 @@ function rangeish()
 	fi
 }
 
+dim_alias_xt=extract-tags
+function dim_extract_tags
+{
+	local branch=$1
+	shift
+	local range=$(rangeish "$1")
+	local file=`mktemp`
+
+	assert_branch $branch
+	assert_repo_clean
+
+	cat > $file
+
+	echo "message_print_body \"$file\""
+	local tags=$(message_print_body "$file" | grep -ai '^[^>]*[A-Za-z-]\+: [^ ]')
+	test -n "$tags" || return 0
+	local tags=$(printf -- "--- extracted tags ---\n%s" "$tags")
+	git filter-branch -f --msg-filter "cat ; echo \"$tags\"" $range
+}
+
+dim_alias_xq=extract-queued
+function dim_extract_queued
+{
+	dim_extract_tags drm-intel-next-queued "$@"
+}
+
+dim_alias_xf=extract-fixes
+function dim_extract_fixes
+{
+	dim_extract_tags drm-intel-fixes "$@"
+}
+
+dim_alias_xnf=extract-next-fixes
+function dim_extract_next_fixes
+{
+	dim_extract_tags drm-intel-next-fixes "$@"
+}
+
 dim_alias_check_patch=checkpatch
 dim_alias_cp=checkpatch
 function dim_checkpatch
-- 
2.10.2